i find hillsbrad foothills to be the best farming areas for herbalism and for rare mobs. if you are looking for transmog sets hillbrad is the best to find shimmering set (cloth, green and white), scout set (leather, all black), or fortified set (mail, orange/brown). all of these sets can be obtained from killing the rare mobs, also along the way (once you find all the rare mobs spawns) you can set up a very good herbalism farming trail to bring alchemy or inscription up or just to make higher end scrolls, potions, etc... (briarthorn, bruiseweed, mageroyal, swiftthistle, and strangle kelp are the only herbs you can get from hillsbrad.)